Radiation Oncology/Carcinoid/Appendix

Appendiceal Carcinoid

For other carcinoid tumors, see Carcinoids


Was added as a separate classification starting with the 7th edition of the AJCC Staging Manual. Carcinoids were not previously classified by the AJCC.

There is a separate staging system for carcinomas arising within the appendix. Carcinoid tumors arising in other segments of the gastrointestinal tract are staged separately.

AJCC 7th Edition (2009)
Primary Tumor

  • T1 - 2 cm or less
    • T1a - 1 cm or less
    • T1b - >1 cm and 2cm or less
  • T2 - >2 cm and 4 cm or less, or with extension to the cecum
  • T3 - >4 cm, or with extension to the ileum
  • T4 - directly invades other adjacent organs or structures (e.g., abdominal wall, skeletal muscle; penetration of the mesoappendix is not included)

Regional Lymph Nodes

  • N0 - none
  • N1 - yes

Distant Metastasis

  • M0 - none
  • M1 - yes

Stage Grouping

  • I - T1 N0
  • II - T2-3 N0
  • III - T4 or N1
  • IV - M1